Malicious PDF — malware analysis report

Static analysis result for SHA-256 5282b51b8ba3c4e3…

MALICIOUS

PDF

76.8 KB Created: 2021-02-13 22:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 88a1c5fac4ec4be90019171f651afa76 SHA-1: 7af78f88565e9157750dc4f3ca712904b0bf6aa8 SHA-256: 5282b51b8ba3c4e33e9b10be994bcfd014e2ccf546f689440d441656210447b2
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to redirectors and link farms, indicating a malicious intent to direct users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains a URL that aligns with the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=boom+boom+volleyball+unblocked In PDF document text
    • https://cdn.sqhk.co/mafowixodi/g1ciaha/44329399803.pdfIn PDF document text
    • https://lizatupapej.weebly.com/uploads/1/3/4/4/134401074/803520.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/ggnihhd/83002478865.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/jfjiiiJ/city_photo_editor_city_photo_frame.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/podivewux.pdfIn PDF document text
    • http://jnatural.space/the_accidental_superpowerqz9cd.pdfIn PDF document text
    • http://copyright-supporthelp.com/introduction_to_environmental_engineering_and_science_masterscbcva.pdfIn PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/faada99.pdfIn PDF document text
    • http://fruit-italy.space/alternative_energy_sources_ielts_reading_answer4xz27.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/d0d8dcf.pdfIn PDF document text
    • http://mmuuue.space/uc_dictionary_app_free_download1rve1.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/gejjihg/31303153700.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sewamos/50124542093.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/acid_rain_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/cake_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/crumple_zone_gizmo_answer_key.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 5224 bytes
SHA-256: 58bcfb1567ded7bb07a6255899212965fbbd8b9e9c1f854bd6e038a6b104237b
font_01_sfnt_off0000e928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 11096 bytes
SHA-256: 5434bb29c3705c1ad09e6dcb90cc9bf25081656d1b48c58927870093864ecae3
font_02_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 16224 bytes
SHA-256: 5f3bf50395e8d1b65f29ab90a426c3665da69f8437ae50e88eef237d5e22552a

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